Two-section type powder falling and laying structure

Abstract

The utility model discloses a two-section type powder falling and laying structure which comprises a motion platform, an equipment outer cover, a material distributing mechanism and a powder laying mechanism, the equipment outer cover is fixed at one end of the motion platform, the material distributing mechanism is fixed on the inner top face of the equipment outer cover, the material distributing mechanism comprises a material feeding powder bin and a material distributing box, and the material distributing box is fixed on the inner top face of the equipment outer cover. A gear shaft is arranged in the material distribution box, a material distribution motor is arranged at one end of the material distribution box, the powder spreading mechanism comprises a mounting frame and a powder bed, a powder falling bin, a powder spreading pattern flour roller and a powder spreading plain roller are arranged at the bottom of a top plate of the mounting frame, and a screen is arranged at the bottom of the powder falling bin; and a vibration generator connected with the screen is arranged on the mounting frame. The two-section type powder falling and laying structure is advanced in design, compact in structure and convenient to use, and effectively solves the problems of powder agglomeration, non-uniform powder falling, low powder laying efficiency and instability existing in upper powder falling and laying of a binder 3D printing large forming size.

Description

Technical Field

[0001] The utility model belongs to the technical field of 3D printing, and specifically relates to a two-stage powder dropping and spreading structure. Background Art

[0002] 3D printing technology refers to the process of converting the complex three-dimensional shape of the required workpiece into a combination of simple two-dimensional cross-sections through slicing. Many 3D printing technologies use powder as the raw material for layer-by-layer printing, layered stacking, and "growing" from bottom to top into a three-dimensional product with any complex shape structure. The 3D printing process can effectively overcome the defects of complex structures and complex processes that are difficult to process with traditional processes. At the same time, it has greatly changed the product design concept. Compared with traditional processing technology, its processing cost is low, material utilization rate is high, and processing speed is fast. Among them, the forming system is the core component of the 3D printing equipment, which mainly includes the powder feeding and spreading system and the forming process.

[0003] In the prior art, the binder 3D printing equipment with large molding bins basically adopts two methods: pushing powder down and dropping powder on the integrated bin to achieve powder dropping and spreading. Among them, the method of pushing powder down is to put the powder in the powder bin next to the molding bin, push it from bottom to top through the mechanism, and then use the roller to push the powder flat to the molding bin to form powder spreading. This method has high requirements on powder fluidity and narrow adaptability; the method of dropping powder on the integrated bin can achieve the function by adding the powder directly to the bin at one time. The large molding bin requires more powder. Adding it to a large bin at one time will cause the load of the powder spreading motion structure to be too large and the load will gradually decrease as the work progresses, resulting in unstable operation of the powder spreading motion structure. In addition, when the powder is dropped by ultrasonic vibration, it will agglomerate in the bin, causing the amount of powder dropping to be uncontrollable or segregated, thereby resulting in uneven density of powder bed molding. Therefore, it is urgent to design a two-stage powder dropping and spreading structure to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a two-stage powder dropping and spreading structure to solve the problems existing in the above-mentioned background technology.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a two-stage powder dropping and spreading structure, comprising:

[0006] Sports platform;

[0007] A device housing, wherein the device housing is fixed to one end of the motion platform;

[0008] A material distribution mechanism, the material distribution mechanism is fixed to the inner top surface of the equipment outer cover, the material distribution mechanism includes a feeding powder bin and a material distribution box arranged at the bottom of the feeding powder bin, a gear shaft is arranged inside the material distribution box, and a material distribution motor is provided at one end of the material distribution box, which is transmission-connected to the gear shaft;

[0009] Powder spreading mechanism, the powder spreading mechanism includes a mounting frame movably connected to a moving platform and a powder bed fixedly connected to the top of the moving platform. A powder dropping bin, a powder spreading patterned roller, and a powder spreading smooth roller are respectively provided at the bottom of the top plate of the mounting frame. A screen is provided at the bottom of the powder dropping bin, and a vibration generator connected to the screen is provided on the mounting frame.

[0010] Further, linear guide rails are fixed on both sides of the bottom of the moving platform. Sliders are slidably connected to the linear guide rails, and a driving motor for driving the sliders to reciprocate along the linear guide rails is provided at one end of the linear guide rails.

[0011] Further, a first through opening is provided at the top of the equipment housing. The top end of the feeding powder bin is embedded and fixed in the first through opening. The two side plates at the bottom of the feeding powder bin are inclined, and the longitudinal section of the feeding powder bin is a bullet head structure.

[0012] Furthermore, strip-shaped through openings corresponding to the discharge ports of the feeding powder bin are provided at both the top and bottom of the material distribution box. Inclined surface support plates are provided on both sides of the strip-shaped through opening at the top of the material distribution box, and the inner side surface of the material distribution box is an arc surface close to the gear shaft.

[0013] Furthermore, both sides of the mounting frame are respectively fixedly connected to the corresponding sliders, and the mounting frame adopts a gantry structure.

[0014] Still further, a second through opening is provided on one side of the top of the mounting frame. The top end of the powder dropping bin is embedded and fixed in the second through opening. A U-shaped groove opening is provided on one side of the second through opening, and the vibration generator is fixed in the U-shaped groove opening.

[0015] Still further, a first roller support and a second roller support are arranged in parallel at the bottom of the mounting frame. A first rotating motor for driving the powder spreading patterned roller to rotate is provided at one end of the first roller support, and a second rotating motor for driving the powder spreading smooth roller to rotate is provided at one end of the second roller support. A limiting block is fixed inside the first roller support.

[0016] Still further, a height adjuster is provided on one side of the top of the mounting frame. The height adjuster includes a nut, a screw rod, and a lifting block. The nut is fixed at the top end of the screw rod. The screw rod penetrates through the mounting frame and is threadedly connected to the mounting frame. The lifting block is movably connected to the limiting block.

[0017] The technical effects and advantages of the present utility model:

[0018] (1) The two-stage powder dropping and spreading structure is advanced in design, compact in structure and convenient to use. By setting a material distribution mechanism and a powder spreading mechanism, two-stage powder dropping and spreading can be realized, effectively solving the problems of powder agglomeration, uneven powder dropping, low powder spreading efficiency and instability existing in the powder dropping and spreading of large forming sizes in binder 3D printing.

[0019] (2) This structural design enables the quick replacement of the sieve mesh, and the height of the powder spreading patterned roller can be adjusted by setting a height adjuster, greatly enhancing the versatility, so that the two-stage powder dropping and spreading structure can achieve good powder spreading effects for powders with different particle sizes and fluidities.

[0020] (3) It can effectively avoid the problem of too large a load on the powder spreading mechanism caused by the one-time filling of a large amount of powder, making the load of the powder spreading mechanism consistent, running smoothly and having a good powder spreading effect.

[0021] (4) By setting a material distribution box, a gear shaft and a material distribution motor, the amount of powder dropping and spreading each time can be controlled, facilitating the effective calculation of the powder usage. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the present utility model;

[0023] Figure 2 is a front view of the present utility model;

[0024] Figure 3 is a bottom view of the present utility model;

[0025] Figure 4 is a schematic structural diagram of the powder spreading mechanism of the present utility model from another angle;

[0026] Figure 5 is a vertical cross-sectional view of the powder spreading mechanism of the present utility model in the main viewing direction;

[0027] Figure 6 is a vertical cross-sectional view of the material distribution box of the present utility model in the main viewing direction.

[0028] In the figure: 100, moving platform; 101, linear guide rail; 102, slider; 103, driving motor; 200, equipment outer cover; 300, material distribution mechanism; 301, upper powder bin; 302, material distribution box; 3021, strip-shaped through opening; 3022, inclined surface support plate; 303, gear shaft; 304, material distribution motor; 400, powder spreading mechanism; 401, mounting frame; 402, powder dropping bin; 403, sieve mesh; 404, vibration generator; 405, powder spreading patterned roller; 406, powder spreading smooth roller; 407, powder bed; 408, roller support one; 4081, limit block; 409, roller support two; 410, height adjuster. Detailed Embodiments

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The utility model provides Figures 1-6 A two-stage powder dropping and spreading structure as shown in the figure comprises:

[0033] Motion platform 100;

[0034] The equipment housing 200 is fixed to one end of the motion platform 100;

[0035] The material distribution mechanism 300 is fixed on the inner top surface of the equipment cover 200. The material distribution mechanism 300 includes a feeding powder bin 301 and a material distribution box 302 arranged at the bottom of the feeding powder bin 301. A gear shaft 303 is arranged inside the material distribution box 302. A material distribution motor 304 is provided at one end of the material distribution box 302 and is transmission-connected to the gear shaft 303.

[0036] Powder spreading mechanism 400, the powder spreading mechanism 400 includes a mounting frame 401 movably connected to the moving platform 100 and a powder bed 407 fixedly connected to the top of the moving platform 100. A powder dropping bin 402, a powder spreading patterned roller 405 and a powder spreading smooth roller 406 are respectively provided at the bottom of the top plate of the mounting frame 401. A screen 403 is provided at the bottom of the powder dropping bin 402, and a vibration generator 404 connected to the screen 403 is provided on the mounting frame 401.

[0037] Exemplarily, refer to Figure 3 As shown, linear guide rails 101 are fixed to both sides of the bottom of the moving platform 100. Sliders 102 are slidably connected to the linear guide rails 101. A driving motor 103 for driving the slider 102 to reciprocate along the linear guide rail 101 is provided at one end of the linear guide rail 101.

[0038] In this technical solution, the driving motor 103 provides power support for the linear reciprocating motion of the slider 102. The working principle of the linear guide rail 101 is a prior art and will not be elaborated here.

[0039] Exemplarily, refer to Figures 1-2 As shown, a first through hole is provided at the top of the equipment housing 200. The top end of the feeding powder bin 301 is embedded and fixed in the first through hole. The two side plates at the bottom of the feeding powder bin 301 are inclined, and the longitudinal section of the feeding powder bin 301 is a bullet head structure.

[0040] In this technical solution, it is convenient for the powder to be poured into the feeding powder bin 301 through the first through hole. The bullet head structure of the feeding powder bin 301 can guide the falling powder, so that the powder converges towards the discharge port during the falling process.

[0041] Exemplarily, refer to Figure 6 As shown, strip-shaped through holes 3021 corresponding to the discharge port of the feeding powder bin 301 are provided at both the top and the bottom of the material distribution box 302. Inclined surface support plates 3022 are provided on both sides of the strip-shaped through hole 3021 at the top of the material distribution box 302. The inner side surface of the material distribution box 302 is an arc surface close to the gear shaft 303.

[0042] In this technical solution, it is convenient for the powder to enter and exit the material distribution box 302 through the strip-shaped through hole 3021. The inclined surface support plates 3022 can disperse the gravity from the powder to both sides, making the powder without support in the middle fall more smoothly. The gear shaft 303 and the strip-shaped through hole 3021 are on the same axial plane. The powder is blocked by the gear shaft 303 when passing through the material distribution box 302. When the gear shaft 303 rotates, it can drive the powder to fall. By setting the rotation speed and time of the gear shaft 303, quantitative powder dropping can be achieved.

[0043] Exemplarily, refer to Figures 1-4As shown, both sides of the mounting frame 401 are fixedly connected to their corresponding sliders 102 respectively, and the mounting frame 401 adopts a gantry structure.

[0044] In this technical solution, while the driving motor 103 drives the slider 102 to move, it can also drive the mounting frame 401 to reciprocate along the linear guide 101, thereby facilitating the movement of the powder dropping bin 402 to directly above the powder bed 407 for powder dropping and powder spreading operations.

[0045] Exemplarily, refer to Figures 1-2 and Figure 5 As shown, on one side of the top of the mounting frame 401, there is a second through opening. The top end of the powder dropping bin 402 is embedded and fixed in this second through opening. On one side of the second through opening, there is a U-shaped notch, and the vibration generator 404 is fixed in this U-shaped notch.

[0046] In this technical solution, when the mounting frame 401 moves directly below the feeding powder bin 301 and aligns the strip-shaped through opening 3021 at the bottom of the material distribution box 302 with the second through opening at the top of the mounting frame 401, it is convenient for the powder in the material distribution box 302 to enter the powder dropping bin 402. The vibration generator 404 is fixed in the U-shaped notch on one side of the second through opening, which is convenient for vibrating the screen 403 at the bottom of the powder dropping bin 402 to evenly spread the powder on the powder bed 407.

[0047] Exemplarily, refer to Figure 1 and Figures 4-5 As shown, the roller support one 408 and the roller support two 409 are arranged in parallel at the bottom of the mounting frame 401. At one end of the roller support one 408, there is a first rotating motor for driving the powder spreading patterned roller 405 to rotate. At one end of the roller support two 409, there is a second rotating motor for driving the powder spreading smooth roller 406 to rotate. Inside the roller support one 408, a limiting block 4081 is fixed.

[0048] In this technical solution, when the powder dropping operation is completed and the mounting frame 401 returns to the left along the linear guide 101, the powder spreading patterned roller 405 and the powder spreading smooth roller 406 rotate simultaneously. The powder spreading patterned roller 405 scatters and spreads the powder piled up on the surface of the powder bed 407 in front, and then the powder spreading smooth roller 406 rolls the powder flat on the powder bed 407, realizing the flattening of the powder on the powder bed 407.

[0049] Exemplarily, refer to Figures 1-2 and Figure 5 As shown, on one side of the top of the mounting frame 401, there is a height adjuster 410. The height adjuster 410 includes a nut, a screw rod, and a lifting block. The nut is fixed at the top end of the screw rod, the lifting block is fixed at the bottom end of the screw rod, the screw rod passes through the mounting frame 401 and is threadedly connected to the mounting frame 401. The lifting block is movably connected to the limiting block 4081, and they can only rotate relative to each other and cannot pull each other.

[0050] In this technical solution, the height of the screw rod is changed by rotating the nut, and the screw rod drives the lifting block to move up or down. Then, the lifting block drives the roller support 408 to move up or down, realizing the height adjustment of the powder spreading patterned roller 405 relative to the powder bed 407, which is convenient for applying powders with different particle sizes and different fluidities to be leveled on the powder bed 407.

[0051] Working principle: When the two-stage powder dropping and spreading structure is in use, first, the powder material is loaded into the feeding powder bin 301. Then, the powder spreading mechanism 400 is driven by the driving motor 103 to move leftward. When the powder dropping bin 402 reaches below the material distributing mechanism 300, the gear shaft 303 is driven to rotate by the material distributing motor 304, and the powder material is quantitatively conveyed into the powder dropping bin 402. After the powder dropping bin 402 receives the powder material, the powder spreading mechanism 400 is driven by the driving motor 103 to move rightward. When the powder dropping bin 402 reaches above the powder bed 407, the vibrating generator 404 vibrates the screen 403 below the powder dropping bin 402, and the powder material is evenly spread on the powder bed 407. When the driving motor 103 drives the powder spreading mechanism 400 to return leftward, the powder spreading patterned roller 405 and the powder spreading smooth roller 406 rotate simultaneously. The powder spreading patterned roller 405 scatters and spreads the powder material piled up on the surface of the powder bed 407 in front, and then the powder spreading smooth roller 406 rolls the powder material flat on the powder bed 407, realizing the flattening of the powder on the powder bed 407. This two-stage powder dropping and spreading structure has an advanced design, a compact structure, and is convenient to use. By setting the material distributing mechanism 300 and the powder spreading mechanism 400, two-stage powder dropping and spreading can be realized, effectively solving the problems of powder aggregation, uneven powder dropping, low powder spreading efficiency, and instability in the upper powder dropping and spreading of binder 3D printing with large forming sizes. This structural design enables the screen 403 to be quickly disassembled and replaced, and the height of the powder spreading patterned roller 405 is adjusted by setting the height adjuster 410, greatly enhancing the versatility, so that this two-stage powder dropping and spreading structure can have a good powder spreading effect on powders with different particle sizes and different fluidities. It can effectively avoid the problem that the powder spreading mechanism 400 has too large a load caused by a large amount of powder material being added at one time, making the load of the powder spreading mechanism 400 consistent, running smoothly, and having a good powder spreading effect. By setting the material distributing box 302, the gear shaft 303, and the material distributing motor 304, the powder dropping amount for each powder spreading can be controlled, facilitating the effective calculation of the powder material usage.

[0052] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A two-stage powder dropping and spreading structure, characterized in that: include: MotionPlatform(100); A device housing (200), wherein the device housing (200) is fixed to one end of the motion platform (100); A material distribution mechanism (300), the material distribution mechanism (300) being fixed to the inner top surface of the equipment outer cover (200), the material distribution mechanism (300) comprising a feeding powder bin (301) and a material distribution box (302) arranged at the bottom of the feeding powder bin (301), a gear shaft (303) being arranged inside the material distribution box (302), and a material distribution motor (304) being transmission-connected to the gear shaft (303) being arranged at one end of the material distribution box (302); A powder spreading mechanism (400) comprising a mounting frame (401) movably connected to a moving platform (100) and a powder bed (407) fixedly connected to the top of the moving platform (100); a powder dropping bin (402), a powder spreading pattern roller (405) and a powder spreading smooth roller (406) are respectively provided at the bottom of a top plate of the mounting frame (401); a screen (403) is provided at the bottom of the powder dropping bin (402); and a vibration generator (404) connected to the screen (403) is provided on the mounting frame (401).

2. The two-stage powder dropping and spreading structure according to claim 1 is characterized in that: Linear guide rails (101) are fixed on both sides of the bottom of the motion platform (100), a slider (102) is slidably connected to the linear guide rail (101), and a driving motor (103) is provided at one end of the linear guide rail (101) for driving the slider (102) to reciprocate along the linear guide rail (101).

3. The two-stage powder dropping and spreading structure according to claim 1 is characterized in that: A through opening 1 is provided on the top of the equipment cover (200), and the top of the feeding powder bin (301) is embedded and fixed in the through opening 1. The two side plates at the bottom of the feeding powder bin (301) are arranged obliquely, and the longitudinal section of the feeding powder bin (301) is a bullet head structure.

4. The two-stage powder dropping and spreading structure according to claim 1 is characterized in that: The top and bottom of the material distribution box (302) are both provided with strip-shaped openings (3021) corresponding to the discharge opening of the feeding powder bin (301); inclined support plates (3022) are provided on both sides of the strip-shaped opening (3021) at the top of the material distribution box (302); and the inner side surface of the material distribution box (302) is an arc-shaped surface close to the gear shaft (303).

5. The two-stage powder dropping and spreading structure according to claim 2 is characterized in that: Both side edges of the mounting frame (401) are respectively fixedly connected to the corresponding sliding blocks (102), and the mounting frame (401) adopts a gantry structure.

6. The two-stage powder dropping and spreading structure according to claim 1 is characterized in that: A second opening is provided on one side of the top of the mounting frame (401), and the top of the powder dropping bin (402) is embedded and fixed in the second opening. A U-shaped notch is provided on one side of the second opening, and the vibration generator (404) is fixed in the U-shaped notch.

7. The two-stage powder dropping and spreading structure according to claim 1 is characterized in that: A roller support bracket 1 (408) and a roller support bracket 2 (409) are arranged in parallel at the bottom of the mounting frame (401); a rotating motor 1 for driving a powdering surface roller (405) to rotate is arranged at one end of the roller support bracket 1 (408); a rotating motor 2 for driving a powdering surface roller (406) to rotate is arranged at one end of the roller support bracket 2 (409); and a limiting block (4081) is fixed inside the roller support bracket 1 (408).

8. The two-stage powder dropping and spreading structure according to claim 7 is characterized in that: A height adjuster (410) is provided on one side of the top of the mounting frame (401), and the height adjuster (410) comprises a nut, a screw rod and a lifting block, the nut is fixed to the top of the screw rod, the screw rod passes through the mounting frame (401) and is threadedly connected to the mounting frame (401), and the lifting block is movably connected to the limit block (4081).

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